Installation of a Fujitsu wall-mounted heat pump in Southwest Montreal
AirGreen installed a Fujitsu wall-mounted heat pump in Southwest Montreal, positioned high above a stair landing to stabilize the temperature between floors, improve air circulation and ensure comfort in summer and winter.
Take a tour of the installation
Each number is a point we check on site. Switch between summer and winter to watch air and heat move.
In summer, the outdoor unit rejects the house's heat outside.
Generic illustration of this type of installation, not a survey of this job site. Tap a number.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
In the Southwest, modern interior design is common: white walls, black metal railings, open spaces, and… staircases that connect the floors like a natural air chimney. It is precisely in this type of residential environment that we recently installed a Fujitsu wall-mounted heat pump , designed to provide consistent comfort on multiple levels without compromising aesthetics.
Here, the objective was clear: to efficiently cool in the summer, to comfortably heat in the winter , and above all to standardize the temperature between the bottom and top of the stairs — a frequent challenge in townhouses and multi-story condos.
Why a wall-mounted heat pump in a space with landings and stairs?
An open staircase often creates two problems:
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Air stratification : warm air naturally rises, and cool air “falls” — but not always where it is needed.
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Uncomfortable zones : one floor may become overheated while the other remains too cool.
The solution isn't simply to install a "more powerful" unit. The key is to position the indoor unit correctly and optimize airflow.
In this project, the wall-mounted unit was installed high up, above the landing , in order to:
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project the air in a controlled manner along the volume,
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better “attach” the stairwell (traffic effect),
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limit dead zones (hot/cold corners).
The unit installed: Fujitsu, a sure bet for Montreal
The brand to respect for this project is Fujitsu — and it is particularly relevant in Greater Montreal, where temperature variations are marked.
In this installation, we opted for a configuration consistent with Fujitsu's current residential product lines, including a Fujitsu Altair wall-mounted heat pump (e.g., Altair 500 – KPAS, R-32) , known for:
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its heating performance for our winters,
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its excellent modulation control (more stable comfort),
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its discreet operation,
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its reliability in residential use.
Even when the exact model is not legible in the photo, the AirGreen approach remains the same: to offer a realistic, consistent option adapted to the type of dwelling, the volume of air and the actual needs of the customer.
Visible installation details and technical choices (what makes the difference)
The image shows a clean and minimalist setup, typical of a contemporary interior in the Southwest:
1) High positioning on the wall, near the ceiling
This is a key point: the higher the unit is placed, the better the air jet's range and the more effective the air circulation. In a stairwell, this helps stabilize the differences in temperature between floors.
2) Targeted air diffusion to "work" the staircase
The air outlet flap is adjustable: we adjust the direction to avoid an unpleasant direct blow and to favor an enveloping circulation .
3) Working at height with secure access
The use of ladders is clearly evident: in this type of location, the quality of the installation also depends on safety, precision, and anchoring. A unit that is poorly secured to a high wall will cause noise, vibrations… and problems in the medium term.
4) Routing of connections and visual finish
In projects where aesthetics matter (which is almost always the case in Montreal, especially in the Southwest), we aim for:
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a transition of connections that is as discreet as possible,
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a clean and symmetrical alignment,
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an installation that “blends” into the surroundings.
The real issue: everyday comfort, not just temperature
A properly installed wall-mounted heat pump isn't just about "it's 21°C". It's about:
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fewer fluctuations (we don't go from too hot to too cold),
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Less noise (stable installation + intelligent settings),
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less dry air in winter thanks to regular heating,
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a better feeling of comfort as soon as you move between floors.
In a house/condo with stairs, the main goal is to avoid:
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an overly hot room upstairs
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a living room that was too cool downstairs
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and the temptation to overcompensate (which increases the bill).
Good practices that we systematically apply (and which protect the client)
Here's what we check and adjust on this type of installation:
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Height and clearances : for efficient air intake and easy maintenance.
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Tilt and drainage : reliable condensate management (essential in air conditioning).
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Vibration reduction : fixings, leveling, support stability.
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Broadcast settings : stream direction, modes, speeds, scheduling.
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Usage tips : how to achieve comfort without over-consuming.
Why this type of installation is particularly popular in the Southwest
The Southwest is a mix of:
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modern condos,
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renovated townhouses,
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transformed plex,
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open-plan spaces with a mezzanine.
And in all these cases, the wall-mounted heat pump becomes an ideal solution because it:
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It can be installed without redoing the entire ventilation system.
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offers excellent performance
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takes up little space,
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provides heating and air conditioning in a single system.
Conclusion: a well-positioned Fujitsu = multi-story comfort, without compromise
In this project, the installation of the Fujitsu wall-mounted heat pump above the stair landing provides much more consistent comfort between levels, while maintaining a clean and discreet finish — exactly what is sought in a contemporary interior in Greater Montreal.
At AirGreen , our strength lies in combining:
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a perfect pose ,
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logical technical choices ,
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and a vision of “real comfort” (not just numbers).
The big day, step by step
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
We look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
What would it look like at your place?
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Conversion: 1 W = 3.412 BTU/h. An indication, not a load calculation: baseboards and furnaces are often stronger than the real need, and they can stay as backup. AirGreen confirms the capacity on site.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
Is your home ready?
Check what applies at your place. A "no" is not a refusal: it is what we sort out during the estimate.
Four statements: true or false?
It all comes down to details you have just seen.
1. In heating mode, the outdoor unit can produce water.
During defrost cycles. That water must drain away without forming ice.
2. You pick the capacity with a simple square-footage rule.
Windows, insulation, orientation and how the room is used all count. Capacity is chosen on site.
3. A multi-zone connects several indoor heads to a single condenser.
One head per room, all on the same condenser. Each room keeps its own temperature.
4. The disconnect can sit behind the patio furniture.
It must stay accessible: it is what shuts the unit off for service.
0 / 4 right answers
What people ask us about this kind of work
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
How cold can it heat?
How much can I save?
How is the LogisVert assistance calculated?
Is it noisy?
The outdoor unit is covered in ice: is that normal?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
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Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).